轴颈倾斜时滚柱轴承动态接触特性的有限元分析

针对滚柱轴承工作时存在轴颈倾斜的情况,利用ANSYS/LS-DYNA有限元分析软件开展不同轴颈倾斜角下滚动轴承动态接触特性的数值模拟研究,通过对比分析接触部位应力值和变形的差别,考察倾斜角大小对轴承动态接触特性影响情况。结果表明,考虑轴颈倾斜时滚子组最大等效应力、最大剪切应力仿真结果明显大于非倾斜状态下得到的结果,在倾斜角为0°、0.1°和0.5°等3种情况下,滚子组等效应力分别为700MPa、2.73GPa和4.0GPa;同时,滚子端面单元应力值和接触部位应力分布等仿真结果均随倾角增大而差异更加明显;但轴心在径向载荷方向的位移受倾斜角的影响不明显,均分布在-0.2～0.3mm范围内。研究结论可以为实际工作过程中考虑轴颈倾斜时滚柱轴承动态特性的研究和轴承结构优化设计提供参考。

Finite-element analysis on dynamic contact characteristics of cylindrical roller bearing considering misalignment with journal

Misalignment of shaft journal usually takes place in shaft-bearing system and can not be neglected in the design of bearing. With different slant angles of shaft journal, numerical simulation on dynamic contacting behavior of roller bearings were carried out by using dynamic finite element models based on ANSYS/LS-DYNA. The effect on contact elements from the changing of slant angles was obtained by comparing and analyzing the value of distortion and stress. And dynamic contacting characteristics of a cylindrical roller bearing considering misalignment were investigated here carefully. It found that the maximum value of von mises stress and shear stress on rollers would be much bigger when considering misalignment of shaft journal. In the three cases of that slant angle were 0°, 0.1° and 0.5°, the maximum value of von mises stress on rollers were 700 MPa, 2.73 GPa and 4.0 GPa separately. The value of the stress on end face element and the distribution of the stress on contact position were all changed with the slant angles. While impact on the displacement of the axes along loading from slant angles was very small, and the displacements were all around -0.2-0.3 mm. Conclusions were expected to give some useful references for the study of dynamic contacting characteristics of roller bearing and the optimum designing of bearing structure when considering misalignment.